Thank you Bernadette for an elaborate answer!

He is athletic, sleeps well and eats animal protein and pretty much everything except dairy (he dislikes it ). I’ll get the calcium levels checked. Any specific calcium supplements you recommend? and the probiotics?

I’ll come back with test results so it’s a clearer picture.

another question: is lactose intolerant something reversible? My daughter gets discomfort when consuming dairy, but I never actually tested her. Now I wonder about her calcium levels too.